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Acquisitions and disposals - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 28, 2018
Dec. 05, 2017
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 27, 2018
Dec. 31, 2015
Business Acquisition [Line Items]                  
Percentage of equity interest acquired                 26.40%
Goodwill $ 67,600,000     $ 67,600,000 $ 67,600,000 $ 71,200,000 $ 67,900,000    
Equity investments fair value               $ 1,600,000  
Asset impairment charges       7,200,000 13,900,000 5,900,000 0    
Consideration paid         0 4,300,000      
Acquisition-related costs       4,300,000          
Business combination, contingent consideration deferred 900,000     900,000 900,000 700,000      
Remeasurement of deferred consideration (recognized in acquisition-related costs)         900,000 1,000,000      
Business combination, contingent consideration, liability, deferred, net         200,000 200,000 400,000    
Business combination, contingent consideration, liability, current           500,000      
Business combination, undiscounted future payment, current 900,000     900,000 900,000   $ 700,000    
Maximum undiscounted amount payable 10,000,000     $ 10,000,000 $ 10,000,000        
Luxfer Holdings NA, LLC                  
Business Acquisition [Line Items]                  
Consideration of disposal   $ 2,200,000              
Amount of debt instrument forgiveness   2,100,000              
Fair value of net assets of acquiree   4,000,000              
Fair value of net assets acquired   2,100,000              
Goodwill   0              
Cash acquired   2,700,000              
Inventory acquired   1,100,000              
Accounts and other receivables acquired   800,000              
Property, plant, and equipment acquired   200,000              
Accounts payable assumed from acquisition   800,000              
Intangible assets acquired   0              
Asset impairment charges   2,400,000              
Revenue of acquiree since acquisition date $ 0                
ESM Group Inc.                  
Business Acquisition [Line Items]                  
Fair value of net assets acquired     $ 5,800,000            
Inventory acquired     700,000            
Property, plant, and equipment acquired     3,200,000            
Consideration paid     4,300,000            
Consideration deferred     300,000            
Business combination, escrow deposit     400,000            
Bargain purchase, gain recognized     1,200,000            
Liabilities assumed form acquisition     100,000            
Acquisition-related costs     500,000            
Provisions for disbursement of environmental liabilities     400,000            
Business combination, consideration deferred           $ 300,000      
ESM Group Inc. | Land and Building                  
Business Acquisition [Line Items]                  
Property, plant, and equipment acquired     $ 2,000,000            
Luxfer Holdings NA, LLC | Gas Transport Leasing LLC                  
Business Acquisition [Line Items]                  
Consideration of disposal   $ 2,200,000              
Luxfer Holdings NA, LLC                  
Business Acquisition [Line Items]                  
Percentage of equity interest acquired   51.00%              
Variable Interest Entity, Not Primary Beneficiary | Luxfer Holdings NA, LLC                  
Business Acquisition [Line Items]                  
VIEs ownership percentage               49.00%